CN111638404A - Operation phase-failure fault detection display device for coal mine motor - Google Patents
Operation phase-failure fault detection display device for coal mine motor Download PDFInfo
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- CN111638404A CN111638404A CN202010635110.0A CN202010635110A CN111638404A CN 111638404 A CN111638404 A CN 111638404A CN 202010635110 A CN202010635110 A CN 202010635110A CN 111638404 A CN111638404 A CN 111638404A
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- phase
- motor
- coal mine
- current
- display device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The invention relates to a device for detecting and displaying an operation open-phase fault for a coal mine motor. In order to overcome the defects of the prior art, the operating phase-lack fault detection display device for the coal mine motor comprises three current mutual inductors, wherein the current mutual inductors are respectively sleeved on three-phase alternating current power lines of a matched three-phase alternating current motor, a stator winding of the matched three-phase alternating current motor adopts a delta connection method, the inductance and the resistance of the three current mutual inductors are the same, two ends of each of the three current mutual inductors are respectively connected into two neutral points according to a star connection method, a zero lead is connected between the two neutral points, and an ammeter is connected to the zero lead in series. In the use process, if the ammeter shows that the current is 0 or basically 0, the alternating voltage output between the two neutral points is 0, and the three-phase alternating current power supply of the three-phase alternating current motor and the induced voltage generated by induction are balanced or basically balanced, so that the problem of phase failure does not exist. The invention has low cost and is not easy to damage, and is widely applied to various coal mine motors.
Description
Technical Field
The invention relates to a device for detecting and displaying an operation open-phase fault for a coal mine motor.
Background
Mining winches are devices used in mines, which are towed by means of wire ropes for their working purpose. The cotton is mainly composed of a motor, a reduction gearbox, a winding drum, a steel wire rope, a hand brake, a clutch and the like. The existing mining winch motors are driven by three alternating currents, and in the operation process, the operation of phase failure sometimes occurs, and the following phenomena can be caused by the phase failure:
1) the winch motor ammeter indicates that the value is higher than a normal value or is zero;
2) the vibration of a winch motor is increased, and the sound is abnormal;
3) the rotating speed of a winch motor is reduced;
4) insufficient load output of winch motor
5) The temperature of the winch motor body and the coil rises.
If the winch cannot be found and processed in time, the damage of a winch motor and even accidents such as winch runaway and derailment can be caused.
Chinese patent application No. CN 107831375 a, published in 23.03.2018, discloses a method for detecting a phase loss of a current transformer, which can be applied to a motor control system, where the motor control system includes a frequency converter and a three-phase motor connected to the frequency converter, and each phase of the three-phase motor is connected to a current transformer.
According to the invention, three current transformers are respectively arranged on a three-phase alternating current power line, and the induced current of the three-phase alternating current power line is directly detected through the current transformers so as to judge whether the three-phase alternating current power line is in phase failure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a coal mine motor operation open-phase fault detection display device which judges whether a motor is open-phase or not by detecting whether the induced current of a power line of a three-phase alternating current motor is balanced or not.
For solving above-mentioned technical problem, this colliery is operation open-phase fault detection display device for motor includes three current mutual inductance coil, and above-mentioned current mutual inductance coil suit respectively is on the three-phase alternating current power cord of adapted three-phase alternating current motor, and the stator winding of adapted three-phase alternating current motor adopts the triangle-shaped method, its characterized in that: the three current mutual inductors have the same inductance and resistance, two ends of the three current mutual inductors are respectively connected into two neutral points according to a star connection method, a zero conductor is connected between the two neutral points, and an ammeter is connected to the zero conductor in series.
In the use process, if the ammeter shows that the current is 0 or basically 0, the alternating voltage output between the two neutral points is 0, the three-phase alternating current power supply of the three-phase alternating current motor is balanced or basically balanced, the induced voltage generated by the three current mutual inductors is balanced or basically balanced, and the problem of phase failure does not exist.
When the phase failure problem occurs, the balance is broken, the two neutral points generate an alternating current power supply, and the phase failure fault is displayed through an ammeter to remind people of the occurrence of the phase failure fault in the running process of the matched three-phase alternating current motor, the matched three-phase alternating current motor is stopped in time, and the matched three-phase alternating current motor, the matched three-phase alternating current power supply and other equipment are checked.
The design only needs one ammeter, and the invention uses whether the induced current generated by the induction of the three current mutual inductors is balanced as the judgment reference, rather than using the induced current as the judgment standard, so that the ammeter has small impact and is not easy to damage.
Preferably, the near ends of the three current mutual inductors close to the adapted three-phase alternating-current motor are connected to form a neutral point, and the far ends of the three current mutual inductors far away from the adapted three-phase alternating-current motor are connected to form another neutral point. The design is symmetrical and balanced in structure.
Preferably, a current limiting resistor is connected to the zero conductor in series. The design is beneficial to protecting the ammeter, and is particularly suitable for the mining winch motor with large fluctuation of no-load and heavy-load current.
And as optimization, the zero lead is also connected with an indicator lamp in series. By the design, the indicating lamp is on and sends out warning light to remind workers to pay attention when the phase is lost.
And as optimization, the zero conductor is also connected with a buzzer in series. By the design, when the phase is lost, the buzzer sends out buzzing warning to remind the working personnel of paying attention.
The device for detecting and displaying the operation open-phase fault for the coal mine motor has the advantages of low cost and difficult damage, and is widely applicable to various coal mine motors.
Drawings
The operation phase-lack fault detection display device for the coal mine motor is further described by combining the accompanying drawings as follows:
FIG. 1 is a circuit schematic diagram of a first embodiment of a service state of a phase failure detection and display device for a coal mine motor;
FIG. 2 is a schematic wiring diagram of the operating phase-failure fault detection display device for the coal mine motor shown in FIG. 1;
FIG. 3 is a schematic circuit diagram of a second embodiment of the operating phase-failure fault detection display device for a coal mine motor in a use state;
FIG. 4 is a schematic circuit diagram of a third embodiment of the operating phase-lack fault detection display device for the coal mine motor in a use state;
FIG. 5 is a schematic circuit diagram of a fourth embodiment of the operating phase-failure fault detection display device for the coal mine motor in use state;
fig. 6 is a schematic circuit diagram of a fifth embodiment of the operating phase-lack fault detection display device for the coal mine motor.
In the figure: 1 is a current mutual inductor, 2 is a matched three-phase alternating current motor, A, B, C is a three-phase alternating current power line, 3 is a stator winding, 4 is a zero lead, 5 is an ammeter, 6 is a current-limiting resistor, 7 is an indicator light, 8 is a buzzer, and O is a neutral point formed by the mutual connection of the near ends of the three-current mutual inductor 1; o is/Is a neutral point formed by the interconnection of the far ends of the three-current mutual inductor 1.
Detailed Description
The first implementation mode comprises the following steps: as shown in fig. 1 and 2, the present inventionThe coal mine motor is with operation open-phase fault detection display device includes three current mutual inductor 1, and above-mentioned current mutual inductor 1 suit respectively on three-phase alternating current power cord A, B, C of adapted three-phase alternating current motor 2, and the stator winding 3 of adapted three-phase alternating current motor 2 adopts the triangle-shaped method, its characterized in that: the three current transformers 1 have the same inductance, the three current transformers 1 have the same resistance, and two ends of the three current transformers 1 are connected into two neutral points O, O by star connection/Two neutral points O, O/A zero conductor 4 is connected between the two, and an ammeter 5 is connected in series on the zero conductor 4.
As shown in fig. 2, the near ends of the three current transformers 1 close to the three-phase ac motor 2 are connected to form a neutral point O, and the far ends of the three current transformers away from the three-phase ac motor 2 are connected to form another neutral point O/。
The second embodiment: as shown in fig. 3, the zero conductor 4 is further connected in series with a current limiting resistor 6, and its use state is as described in the first embodiment, but not limited thereto.
The third embodiment is as follows: as shown in fig. 4, the zero conductor 4 is further connected in series with an indicator light 7, and the indicator light 7 may also play a role in limiting current to a certain extent, and its use state is as described in the first embodiment, but not a little.
The fourth embodiment: as shown in fig. 5, the zero conductor 4 is further connected in series with a buzzer 8, and the buzzer 8 may also play a role in limiting current to a certain extent, and its use state is as described in the first embodiment, but not a little.
The fifth embodiment: as shown in fig. 6, the zero conductor is further connected in series with an indicator light 7 and a buzzer 8, and the use state of the zero conductor is as described in the first embodiment, but not as described in the first embodiment.
Claims (5)
1. The utility model provides a colliery is operation open-phase fault detection display device for motor, includes three current transformer coil, and above-mentioned current transformer coil suit respectively is on the three-phase AC power cord of adapted three-phase AC motor, and the stator winding of adapted three-phase AC motor adopts the triangle-shaped connection method, its characterized in that: the three current mutual inductors 1 have the same inductance and resistance, two ends of the three current mutual inductors are respectively connected into two neutral points according to a star connection method, a zero conductor is connected between the two neutral points, and an ammeter is connected to the zero conductor in series.
2. The operating open-phase fault detection and display device for the coal mine motor according to claim 1, characterized in that: the near ends of the three current mutual inductors close to the adapted three-phase alternating current motor are connected to form a neutral point, and the far ends of the three current mutual inductors far away from the adapted three-phase alternating current motor are connected to form another neutral point.
3. The operating open-phase fault detection and display device for the coal mine motor according to claim 1, characterized in that: and the zero conductor is also connected with a current limiting resistor in series.
4. The operating open-phase fault detection and display device for the coal mine motor according to claim 1, characterized in that: and the zero conductor is also connected with an indicator lamp in series.
5. The operating open-phase fault detection and display device for the coal mine motor according to claim 1, characterized in that: and the zero conductor is also connected with a buzzer in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010635110.0A CN111638404A (en) | 2020-07-03 | 2020-07-03 | Operation phase-failure fault detection display device for coal mine motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010635110.0A CN111638404A (en) | 2020-07-03 | 2020-07-03 | Operation phase-failure fault detection display device for coal mine motor |
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| CN111638404A true CN111638404A (en) | 2020-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010635110.0A Pending CN111638404A (en) | 2020-07-03 | 2020-07-03 | Operation phase-failure fault detection display device for coal mine motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114167154A (en) * | 2021-12-07 | 2022-03-11 | 西安西变组件有限公司 | Phase sequence self-checking motor and phase sequence checking method |
-
2020
- 2020-07-03 CN CN202010635110.0A patent/CN111638404A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114167154A (en) * | 2021-12-07 | 2022-03-11 | 西安西变组件有限公司 | Phase sequence self-checking motor and phase sequence checking method |
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